7x7 game

    Keywords: Ongoing game

Klaus: Some time ago, I started to use a new board size: 7x7!

It is fun to play, and one can learn a lot about tesuji like the Two-stone edge squeeze. Carelessly losing 2 points in yose will cause disaster and a lot of reading is required to handle this size.

An interesting varation is to deny Black to play in the center with his first move.


Black: Klaus
White: jau (DGS 2-dan)
Komi: 6.5

1 - 10  
11 - 20  
21 - 30  
31 - 32  

Black resigns, he can't egalise the high komi.

ilan: Actually, the komi is kind of low. Where's my COFFEE!?

Bill: Hmmm. Looks like the game losing move was B21. Better at 22, no? I don't know.

Problem 1

Robert Pauli: Provided Black doesn't continue this "strategy" and connects above B7 (17) after White did on the first, Bill. :--)

Bill: You mean as in this diagram?

Var. 1  

B3 does look bad. ;-) White's next play is kind of cute, I think.

ilan: Well, I will try this out. Let's see how many mistakes I make... First, I note that Black has much fewer liberties than White on the bottom, so cannot even make seki if it is his move, assuming the top stays as it is. In particular, White has no ko threats against the bottom Black group, so has no ko threats at all if a ko develops on top. So, it is a direct capturing race between the two right hand groups, which both have 3 liberties. Black is threatening to live if it is his move, so White has to do something, and I don't see a way for White to win the capturing race, this being my best effort.

White's attempt  
White's attempt  
Black has too many liberties  

It seems to me that White can escape with some of this stones as follows:

White escapes  

It seems White will win by .5, if Black and White had an equal number of prisoners prior to the part I analysed.

White wins by .5  

Bill: Nice. :-) Actually, White has captured a stone on circle, and wins by 1.5.

ilan: Thanks. Looks like my first correct analysis.

Problem 2

Robert Pauli: Black's right track of course is as "I don't know" Bill suggested, with the obvious continuation:

21 - 25  

White will now certainly lose, but he can keep his loss below five points (remember, one black stone was captured and komi is 6.5). Do you see how?

7x7 game last edited by HermanHiddema on November 7, 2007 - 12:41
RecentChanges · StartingPoints · About
Edit page ·Search · Related · Page info · Latest diff
[Welcome to Sensei's Library!]
Search position
Page history
Latest page diff
Partner sites:
Go Teaching Ladder
Login / Prefs
Sensei's Library